feat: Add Update Notification

[AbhinRustagi]

Pull Request Template

Description

Adds an in-app notification when a newer version of OpenScreen is published on GitHub Releases, plus a Help → Check for Updates… menu entry for explicit checks. Previously, users on older versions had no way to learn that a new release existed without manually visiting the GitHub Releases page.

The notification presents three actions:

• Download — opens the release page in the browser
• Don't remind again — disables future automatic checks
• ✕ — soft-dismisses just this version (a future newer release will still notify)

Motivation

Faced it myself

Type of Change

• New Feature
• Bug Fix
• Refactor / Code Cleanup
• Documentation Update
• Other (please specify)

Related Issue(s)

Closes #527

Screenshots / Video

Screenshot (if applicable):

![Screenshot Description](path/to/screenshot.png)

Video (if applicable):

<video src="path/to/video.mp4" controls width="600"></video>

Testing

Checklist

• I have performed a self-review of my code.
• I have added any necessary screenshots or videos.
• I have linked related issue(s) and updated the changelog if applicable.

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